Download Distributed Quality-of-Service Support in Cognitive Radio by Berlemann L. PDF

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By Berlemann L.

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Extra info for Distributed Quality-of-Service Support in Cognitive Radio Networks

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The initial issuing of spectrum through regulation bodies is done at the primary market, while the transfer of spectrum usage rights between different parties is done at the secondary market. Contrary to licensed spectrum, spectrum trading implies that the owner of spectrum usage rights may differ from the actual user of spectrum. Additionally, spectrum traders may deal with spectrum usage rights as a third party. The subdivision of spectrum into quantities enables a reselling by the license holder to different parties and increases the overall efficiency of spectrum utilization (Walke and Kumar, 2003).

On the other hand, the actual availability of new spectrum is a seemingly intractable problem. Cognitive radios use flexible spectrum access techniques for identifying under-utilized spectrum and to avoid harmful interference to other radios using the same spectrum. Such an opportunistic spectrum access to under-utilized spectrum, whether or not the frequency is assigned to licensed primary services, is referred as overlay spectrum sharing. Overlay sharing requires new protocols and algorithms for spectrum sharing.

6. The space refers to the power level of the signals at the receiver in a specific band at a certain geographical location. Only a small fraction of the radio spectrum is available as open frequency band for unlicensed operation. 11. On the other hand, the actual availability of new spectrum is a seemingly intractable problem. Cognitive radios use flexible spectrum access techniques for identifying under-utilized spectrum and to avoid harmful interference to other radios using the same spectrum.

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